Friction drive for fans



J. H."LEITCH.

FRICTION DRIVE FOR FANS. APPLICATION FILED DEC. 5 I92].

Patented Aug. 15, 19221 MWWWWWM WWW JOHN E. LEITCH, OF DETROIT,

' OF DETROIT, MICHIGAN, CORPORATION 03 MICHIGAN.

MICHIGAN, ASSIGNOR T0 AUTO ACCESSORIES MFG. CO.

u mma nnrvnroarans.

Specification of Letters Eatent. Pfflggntgd'j ug 15 19 22 I Application lined December 5, 19 21: SerialIto. 519,899;

To all ituhomit may canoe mi 'Be it knownthat I, JonnH. LEITOI-I, a citizen ofthe United States of America, residing at Detroit, in the county of Vi/ ayne and State of Michigan, have invented certain new and useful Improvements in l riction Drives for Fans, of which the following is a specification,"reference being had there= into the accon'ipanying "drawings, j

The invention relates to fans for use in connection with radiators of internal com bustion. engines and it is the object of the invention to provide a friction drive for the fan, thereby avoiding difiiculties incident to the use of a pulley and belt drive. It is a further object to obtain a construction which is applicable to engines designed for using a belt and pulley drive and, further, to obtain an exceedingly simple and inexpensive construction. With these objects in view the invention consists in the construction as hereinafter set forth.

In the drawings:

Figure l is a sectional side elevation of my improvement as applied;

Figure 2 is a front elevation thereof;

Figure 3 is a horizontal section showing the manner of mounting the attachment;

Figure 4 is a longitudinal section through a modified construction.

As specifically shown, my device is designed for use as a replacement for a belt connection on Ford cars, but it is obvious that it is also applicable to other constructions.

In detail, A is a shaft, preferably piece of cold-rolled steel having its opposite ends reduced and threaded at B, leaving shoulders C. D are pressed sheet metal cups engaging the shoulders G, and E are similar cups of smaller diameter between which and the outer cups is arranged a cup F of fric-- tion material. All of these parts are clamped to each other by nuts G on the threaded portion of the spindle. H is a tube sleeved upon the shaft A between the cups on opposite ends thereof, and K are brackets secured to the tube H and. located to engage securing bolts such as L and M on the engine casing. Preferably, the bolt L is one of the bolts for securing the. cover of the timing gear housing and the bolt M is that which secures the fan bracket. The brackets K have ,foot portions which are slotted at K to engage said bolts.

In use, to apply the replacement to the car, the belt is removed and the bolts M and L loosened so that the brackets K may beengaged therewith. These brackets are so fashioned that the shaft A will beheld in oblique position, as indicated in Figure 1. This will hold the inner edge of the friction cup at the opposite end of the shaft against the pulley N and the outer edge ofthe lower friction cup against thedrive pulley O, which drives the pulleys in the same direction. parts'will beheld in thispositionf and will consequently transmit the rotation of the" puliey O to the pulley N. i s

in the modified construction shown in Figure e, instead of mounting both friction cups upon a single shaft, a telescopic shaft being used consisting .of a tubular portion P, which surrounds the solid portion A and which carries one of the friction cups, a spring Q is arrangedbetween the end of the solid shaft and the end of the tubular shaft to furnish the necessary pressure forwthe.

friction cups against the pulleys. Also, a

cotter pin R, or equivalentdevice, is used for transmiting the torque from the solid shaft'to the tubularshaft. a

What I claim as my invention is:

1. In an engine, the combination with a fan pulley, a drive pulley therefor, of a shaft arranged obliquely between said pulleys, friction wheels upon opposite ends of said shaft having marginal contact with respective pulleys, and a bearing for supporting said shaft secured to the engine casing. I 2. The combination with an engine having a fan pulley and a drive pulley therefor, a replacement drive connection between said pulleys comprising a shaft, cup-shaped fric- Whentl'ie bolts are tigl'itened', the i tion wheels mountedon opposite ends of said shaft, and a bearing for securing said shaft to the engine casing to be arranged obliquely between said pulleys with the marginal portions of said friction cups in contact with the respective pulleys.

3. The combination with an engine having a fan pulley and a'drive pulley therefor, I

of a replacement drive connection therebetween comprislng a shaft having reduced end portions forming shoulders, metallic cups secured to said end portions and bearing against said shoulders, friction cups mount ed in said metallic cups, a bearing for said shaft adapted to be secured to the engine cups respectively in contact with said pulleys.

4. The combination with an engine having a fan pulley and a drive pulley therefor, of a replacement drive therebetween comprising a shaft, a tube sleeved on said shaft, cupped friction wheels mounted on the op posite ends of said shaft, a pair of brackets secured to said sleeve and engageable with bolts on said engine casing, said brackets being fashioned to hold said shaft in inclined position with the marginal portions of said friction cups on diametrically opposite sides of said shaft in friction contact with the respective pulleys.

5. The combination with an engine having'a fan pulley and drive'pulley therefor, of a replacement drive comprising a shaft having reduced and threaded ends, a tube sleeved on said shaft, pairs of metallic cups ei'igaging the threaded portions of said shaft with cups of friction material therebetween, nuts engaging said threaded portions for clamping said metallic cups against said friction cups, brackets secured to said tube, said'brackets being fashioned to engage bolts upon the engine casing and to hold saidtube and shaft in inclinedposition with diametrically opposite portions of the friction cups respectively in contact with said pulleys;

6. In an engine, the combination with a fan pulley, adriv'e pulley therefor, of a shaft extending between said pulleys, and riot-ion wheels at opposite ends of said shaft for engaging the respective pulleys;

7. In an engine, the combination with a fan pulley and a drive pulley therefor, of a shaft arranged between said pulleys, friction cups secured to the opposite ends of said shaft and engaging said pulleys respectively with diametrically opposite portions thereof, whereby both pulleys are revolved in the same direction.

In testimony whereof Iaflix my signature.

JOHN H. LEITCH. 

